package com.cyzy.interceptor;

import com.alibaba.fastjson.JSON;
import com.cyzy.dto.Result;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@Component
public class LoginInterceptor implements HandlerInterceptor {

    //前切
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        HttpSession session = request.getSession();
        if (session.getAttribute("user") == null) {
            //没有登录
            response.setContentType("text/html;charset=utf-8");
            Result result = Result.error().message("没有登录");
            result.setCode(401);
            response.getWriter().write(JSON.toJSONString(result));

            return  false;
        }
        return HandlerInterceptor.super.preHandle(request, response, handler);
    }

    //环绕
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

    //后切
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}
